I had a tooth removed some years ago and the dentist snapped off part of the root and pushed in into my sinus (maxcillary I believe). I was sent to Hospital to have a scan on it which confimed it was there but that there was a strong possibility that as it was only just sticking through it would cause no issue. Unfortunately this was not the case. Some six months later i started to notice a smell when I sniffed similar to rotting meat. I went to a doctor and he thought it was an infection in my nose and gave me antibiotics. This worked for the short term but the smell returned. I was x rayed again and told the bit of tooth was in sinus completely now rattling aabout and causing the infection. I was told I would need the Caldwell Luc operation which to be frank looked scary. Anyway this didn't happen as i managed to blow my nose harder and harder until finally (after two months) the root fell out of my nose! I felt so much better and for the last three months (after another dose of antibiotics to be sure any infection still in there was killed) I have been fine but in the last few days i have noticed a return of the smell ,only faint this time but still there.  What are my options and what else could it be?